Connecting device of prefabricated concrete box MIC

Abstract

The utility model discloses a prefabricated concrete box MIC connecting device which comprises first embedded I-shaped steel arranged on the side face of a first box reinforcement cage and arranged in a staggered mode from top to bottom, connecting hooks arranged on the first embedded I-shaped steel and second embedded I-shaped steel arranged on the side face of a second box reinforcement cage and arranged in a staggered mode from top to bottom. The lock catch is arranged on the second embedded I-shaped steel and can be locked with the connecting hook; the lock catch on the second pre-buried I-shaped steel is hoisted by a rope, the first box body and the second box body are hoisted to corresponding positions, the rope on the lock catch is unlocked, the lock catch freely falls on the connecting hook, and the lock catch is locked through the self-locking hook at the end of the connecting hook and is prevented from falling off; by observing the connection position of the lock catch and the connection hook, the position deviation is determined for fine adjustment, so that the field connection of the first box body and the second box body is completed; and through connection of the embedded parts, the integrality of the concrete is better, and wall connection is more convenient and easy to control.

Description

Technical Field

[0001] The utility model belongs to the technical field of building construction, and more specifically relates to a connection device for a prefabricated concrete box MIC. Background Art

[0002] As the country's requirements for building assembly rates continue to increase, box buildings, as an effective high-assembly-rate building, are increasingly used in the construction field. Box buildings are structures that are divided into modules of standard sizes, transported to the site for splicing and assembly into a complete building, and then fixed to the ground or other locations. In the existing technology, box buildings are usually fixed using simple steel bars, bolts or welded parts. This connection method is difficult to ensure the uniformity and integrity of the overall structure during the concrete pouring process, and the connection is inconvenient, which affects the overall performance of the building. Traditional connection methods may not be convenient in operation and require more manual intervention and adjustment, which not only increases the difficulty of construction, but may also cause unstable connection quality due to human factors. Due to the complexity of the connection method, it becomes more difficult to control the connection quality during construction, which may lead to construction errors and structural defects. Using traditional connection methods may require more time and labor, which will reduce construction efficiency and increase project costs. Steel bars, bolts or welded parts may have poor adaptability in certain specific construction environments (such as limited space or special climatic conditions), affecting construction progress and quality. Due to the limitations of the connection method, problems such as loosening and corrosion of the connectors may occur in later use, requiring regular inspection and maintenance, increasing maintenance costs.

[0003] Therefore, there is an urgent need for a connection device that can improve the integrity, convenience and controllability of the connection between precast concrete boxes, thereby improving the overall performance of the building. Summary of the Invention

[0004] In response to the above-mentioned defects or improvement needs of the prior art, the present invention provides a connection device for a precast concrete box MIC, which, through the connection of embedded parts, improves the integrity of the concrete, makes the wall connection more convenient and easy to control; it can overcome the problems of the prior art such as the difficulty of wall connection, difficulty in control, and poor integrity of cast concrete.

[0005] In order to achieve the above-mentioned object, the utility model provides a connection device for a precast concrete box MIC, comprising a first embedded I-beam arranged on the side of a first box reinforcement cage and staggered from top to bottom, a connecting hook provided on the first embedded I-beam, a second embedded I-beam arranged on the side of a second box reinforcement cage and staggered from top to bottom, and a lock provided on the second embedded I-beam and capable of locking with the connecting hook; wherein,

[0006] The connecting hook is provided with serrations, a first magnet and a self-locking hook; the lock buckle includes a rotating rod rotatably connected to the second embedded I-beam, side rods vertically arranged at both ends of the rotating rod and a locking rod arranged between the two side rods; the locking rod is provided with tooth grooves adapted to the serrations on the connecting hook and a second magnet adapted to the first magnet.

[0007] Furthermore, the positions of the first embedded I-beam and the second embedded I-beam correspond to each other; the heights of the first embedded I-beam and the second embedded I-beam are the same and are both smaller than the steel bar spacing of the corresponding steel bar cage on the box body.

[0008] Furthermore, the first pre-embedded I-beam and the second pre-embedded I-beam are installed on the first box body or the second box body through an I-beam installation mold.

[0009] Furthermore, nuts are welded to upper and lower ends of the first embedded I-beam and the second embedded I-beam respectively.

[0010] Furthermore, the I-beam installation mold is provided with a plurality of reserved holes, two in a group; the nuts are adapted to the reserved holes on the I-beam installation mold.

[0011] Furthermore, the nut is welded to any one of the two opposite embedded steel plates on the first embedded I-beam and the second embedded I-beam.

[0012] Furthermore, a semicircular steel piece is provided on the second embedded I-beam; and the rotating rod is provided at the center of the semicircular steel piece.

[0013] Furthermore, the self-locking hook is retractably arranged at the hook tip of the connecting hook;

[0014] The first magnet is arranged on the inner bottom of the connecting hook;

[0015] The saw teeth are arranged between the lower edge of the self-locking hook and the upper surface of the first magnet.

[0016] Furthermore, the second magnet is provided on the lower surface of the lock buckle;

[0017] After the lock buckle is fastened to the connecting hook, the top of the first magnet and the second magnet on the lower surface of the lock buckle are attracted to each other.

[0018] Furthermore, the same number of protruding steel bars are staggeredly arranged on the top of the first box body and the second box body; and the protruding steel bars are bent downward.

[0019] The entire surface of the wall opposite to the first box and the second box is provided with a rough water washing surface;

[0020] The first box body and the second box body are connected by post-cast concrete.

[0021] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0022] (1) The utility model relates to a connection device for a precast concrete box MIC, which is characterized by arranging a first embedded I-beam from top to bottom on the side of the first box reinforcement cage, providing a connection hook on the first embedded I-beam, arranging a second embedded I-beam from top to bottom on the side of the second box reinforcement cage, and providing a lock that can be locked with the connection hook on the second embedded I-beam; by lifting the lock on the second embedded I-beam with a rope, the first box and the second box are hoisted to the corresponding position, untying the rope on the lock, allowing it to fall freely on the connection hook, and the lock tongue of the self-locking hook automatically pops out to lock the lock, and then the lock is locked by observing Observe the connection position of the lock buckle and the connecting hook, determine the position deviation and make fine adjustments, then set the same number of protruding steel bars on the top of the first box and the second box, and complete the on-site connection of the first box and the second box; the utility model makes the integrity of the concrete better and the wall connection more convenient and easy to control through the connection of embedded parts; it can overcome the problems of the existing technology such as the difficulty of wall connection, difficulty in control, and poor integrity of poured concrete; the utility model can improve the integrity, convenience and controllability of the connection between precast concrete boxes, thereby improving the overall performance of the building.

[0023] (2) The utility model provides a connection device for a precast concrete box MIC, which is provided with serrations, a first magnet and a self-locking hook on the connection hook; a tooth groove adapted to the serrations on the connection hook and a second magnet adapted to the first magnet are provided on the locking rod of the lock buckle; the self-locking hook is retractably provided at the hook tip of the connection hook, and when the lock buckle is buckled onto the connection hook, the self-locking hook is first pressed into the inside of the connection hook, and after the lock buckle and the connection hook are buckled, the self-locking hook pops out immediately to realize automatic locking of the lock buckle; the first magnet is provided at the inner bottom of the connection hook; the second magnet is provided on the lower surface of the lock buckle; after the lock buckle and the connection hook are buckled, the top of the first magnet and the second magnet on the lower surface of the lock buckle are just attracted to each other, thereby increasing the stability of the connection of the precast concrete box MIC.

[0024] (3) The utility model provides a connection device for a prefabricated concrete box MIC, which is used in the connection of concrete box walls. It ensures convenient installation and easy control, while reducing on-site installation time, saving construction period, reducing manpower consumption, and also increasing the overall performance of concrete and improving earthquake resistance. It can promote the green and sustainable development of the construction industry, has good economic, environmental and social benefits, and enables the prefabricated industry to develop better. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1This is a schematic diagram of the installation state of a connection device for a precast concrete box MIC according to an embodiment of the present utility model;

[0026] Figure 2 This is a partially enlarged schematic diagram of a connection device for a precast concrete box MIC according to an embodiment of the present utility model;

[0027] Figure 3 This is a structural diagram of a locking device for a precast concrete box MIC according to an embodiment of the present invention when being hoisted;

[0028] Figure 4 This is a schematic diagram of the installation position of the nut of a connection device for a precast concrete box MIC according to an embodiment of the present utility model;

[0029] Figure 5 This is a schematic diagram of the installation structure of the embedded I-beam on the I-beam installation mold of a connection device for a precast concrete box MIC according to an embodiment of the present utility model;

[0030] Figure 6 This is a structural schematic diagram of a welding connection hook on a first embedded I-beam of a connection device for a precast concrete box MIC according to an embodiment of the present utility model;

[0031] Figure 7 This is a structural schematic diagram (side view) of a semicircular ring rigid member welded to the second embedded I-beam of a connection device for a precast concrete box MIC according to an embodiment of the present utility model;

[0032] Figure 8 This is a schematic structural diagram (top view) of a semicircular ring rigid member welded to a second embedded I-beam of a connection device for a precast concrete box MIC according to an embodiment of the present invention;

[0033] Figure 9 This is a schematic structural diagram of a lock buckle of a connection device for a precast concrete box MIC according to an embodiment of the present utility model;

[0034] Figure 10 This is a schematic diagram of the overall state of a lock buckle of a connection device of a precast concrete box MIC according to an embodiment of the present utility model being hoisted by a rope.

[0035] In all the drawings, the same figure marks represent the same technical features, specifically: 1-first box body, 2-first embedded I-beam, 3-connecting hook, 31-sawtooth, 32-first magnet, 33-self-locking hook, 4-second box body, 5-second embedded I-beam, 51-semi-circular ring steel, 6-locking buckle, 61-rotating rod, 62-side rod, 63-locking rod, 631-tooth groove, 64-second magnet, 7-I-beam installation mold, 8-nut, 9-rope, 10-weld. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0037] like Figures 1-10 As shown, the utility model provides a connection device for a precast concrete box MIC, comprising a first embedded I-beam 2 arranged on the side of the first box 1 steel cage and staggered from top to bottom, a connecting hook 3 provided on the first embedded I-beam 2, a second embedded I-beam 5 arranged on the side of the second box 4 steel cage and staggered from top to bottom, and a lock 6 provided on the second embedded I-beam 5 and capable of locking with the connecting hook 3; the connecting hook 3 is provided with a serration 31, a first magnet 32 ​​and a self-locking hook 33; the lock 6 includes a second embedded I-beam 5 and a second embedded I-beam 5; the second embedded I-beam 5 ... The embedded I-beam 5 is provided with a rotating rod 61 for rotational connection, side rods 62 vertically arranged at both ends of the rotating rod 61, and a locking rod 63 arranged between the two side rods 62; the locking rod 63 is provided with a tooth groove 631 adapted to the serration 31 on the connecting hook 3 and a second magnet 64 adapted to the first magnet 32; the utility model makes the integrity of the concrete better, the wall connection is more convenient and easy to control through the connection of the embedded parts; it can overcome the problems of the existing technology such as difficult wall connection, difficult control, and poor integrity of cast concrete.

[0038] Furthermore, if Figures 1-10 As shown, the self-locking hook 33 is retractably mounted at the tip of the connecting hook 3. When the lock buckle 6 is fastened to the connecting hook 3, the self-locking hook 33 is first pressed into the interior of the connecting hook 3. After the lock buckle 6 and the connecting hook 3 are fastened, the self-locking hook 33 immediately pops out, automatically locking the lock buckle 6. The first magnet 32 ​​is located at the inner bottom of the connecting hook 3; the second magnet 64 is located on the lower surface of the lock buckle 6. After the lock buckle 6 and the connecting hook 3 are fastened, the top of the first magnet 32 ​​and the second magnet 64 on the lower surface of the lock buckle 6 are attracted to each other, increasing the stability of the connection between the two.

[0039] Furthermore, if Figures 1-10As shown, the first box body 1 and the second box body 4 are arranged side by side; the same number of protruding steel bars are staggered on the top of the first box body 1 and the second box body 4; the protruding steel bars are bent downward; after being transported to the construction site, the staggered steel bars of the first box body 1 and the second box body 4 are tied in pairs to play a fixing role; the first box body 1 and the second box body 4 are connected by post-poured concrete; the entire surface of the opposite wall of the first box body 1 and the second box body 4 is provided with a rough washed surface, which enhances the bonding effect of the post-poured concrete.

[0040] Furthermore, if Figures 1-10 As shown, the connecting hook 3 and the lock buckle 6 are respectively arranged on the two opposite surfaces of the two adjacent boxes; by hanging the square ring lock buckle 6 on the second embedded I-beam 5 with a rope, a knot or embedded part for fixing the rope is left above the second box 4 to prevent the rope from falling off during transportation; the first box 1 and the second box 4 are hoisted to the corresponding positions, and the rope on the lock buckle 6 is untied to allow it to fall freely on the connecting hook 3, and the lock tongue of the self-locking hook 33 automatically pops out to lock the lock buckle 6 to prevent it from falling during the concrete pouring process; by observing the connection position of the lock buckle 6 and the connecting hook 3, the position deviation is determined and fine-tuned, thereby completing the on-site connection between the first box 1 and the second box 4.

[0041] Furthermore, if Figures 1-10 As shown, the first embedded I-beam 2 and the second embedded I-beam 5 are both welded by embedded steel plates; the first embedded I-beam 2 and the second embedded I-beam 5 are installed on the first box body 1 or the second box body 4 through an I-beam mounting mold 7; nuts 8 are welded on the upper and lower ends of the first embedded I-beam 2 and the second embedded I-beam 5 respectively; the I-beam mounting mold 7 is specially made, and a plurality of reserved holes are provided on it, two in a group, and the nuts 8 are adapted to the reserved holes on the I-beam mounting mold 7; the reserved holes on the I-beam mounting mold 7 are used to ensure the accuracy of the position of the first embedded I-beam 2 embedded in the first box body 1 and the second embedded I-beam 5 embedded in the second box body 4, to avoid the impact of concrete causing the embedded steel plate position of the first embedded I-beam 2 and the second embedded I-beam 5 to change, and at the same time, to ensure that the position of the nut 8 can adapt to the reserved holes of the I-beam mounting mold 7. The nut 8 is welded to any one of the two opposite embedded steel plates on the first embedded I-beam 2 and the second embedded I-beam 5 .

[0042] Furthermore, if Figures 1-10As shown, the connecting hook 3 is specially made; the serration 31 is provided between the lower edge of the self-locking hook 33 and the upper surface of the first magnet; a semicircular steel piece 51 is provided on the second embedded I-beam 5; the locking buckle 6 is a square ring, and the rotating rod 61 is provided at the center of the semicircular steel piece 51; the positions of the first embedded I-beam 2 and the second embedded I-beam 5 correspond to each other; the heights of the first embedded I-beam 2 and the second embedded I-beam 5 are the same and are both less than the steel bar spacing of the steel cage on the corresponding box body.

[0043] During operation, the square ring lock buckle 6 on the second embedded I-beam 5 is hoisted with a rope 9 in the factory, and a knot or embedded part for fixing the rope is left above the second box body 4 to prevent the rope from falling off during transportation; after the first box body 1 and the second box body 4 are hoisted to the corresponding positions, the rope on the lock buckle 6 is untied and allowed to fall freely onto the connecting hook 3, and the locking tongue of the self-locking hook 33 automatically pops out to lock the lock buckle 6 to prevent it from falling during the concrete pouring process; by observing the connection position of the lock buckle 6 and the connecting hook 3, the position deviation is determined and fine-tuned to complete the on-site connection; by observing the position deviation of the lock buckle 6 and the connecting hook 3, the position deviation of the first box body 1 and the second box body 4 is determined.

[0044] The utility model provides a connection method for a connection device of a precast concrete box MIC, comprising the following steps:

[0045] S1: Fabrication of the first embedded I-beam 2 and the second embedded I-beam 5; determining the dimensions of the first embedded I-beam 2 and the second embedded I-beam 5 so that the heights of the first embedded I-beam 2 and the second embedded I-beam 5 are the same and both are less than the spacing between the steel bars of the steel cage on the first box 1 or the second box 4; symmetrically welding nuts 8 at the upper and lower ends of the first embedded I-beam 2 and the second embedded I-beam 5;

[0046] S2: The first embedded I-beam 2 produced in step S1 is fixed to the steel cage of the first box body 1 through the I-beam installation mold 7; the second embedded I-beam 5 is fixed to the steel cage of the second box body 4 through another I-beam installation mold 7, the first embedded I-beam 2 is connected to the I-beam installation mold 7 with bolts, and the second embedded I-beam 5 is connected to the other I-beam installation mold 7, and then the molds are closed; then concrete is poured, and after solidification, the bolts and the I-beam installation mold 7 are removed;

[0047] S3: Clean the wall of the box in which the first embedded I-beam 2 and the second embedded I-beam 5 are embedded, so that the embedded steel plates on the first embedded I-beam 2 and the second embedded I-beam 5 are exposed; weld the connecting hook 3 on the embedded steel plate of the first embedded I-beam 2 so that the opening of the connecting hook 3 faces upward; weld the semi-circular steel piece 51 on the embedded steel plate of the second embedded I-beam 5, and install the lock buckle 6 on the semi-circular steel piece 51; plan the welding positions of the connecting hook 3, the semi-circular steel piece 51, and the lock buckle 6 on the two boxes in advance during installation, and draw them with a marker to avoid problems during later connection;

[0048] S4: Carry out interior decoration and plumbing and electricity production of the first box body 1 and the second box body 4, and transport them to the construction site for installation after production is completed; the lock buckle 6 is with a square ring, and the square ring of the lock buckle 6 is hung and fixed on the top of the second box body 4 with a rope 9. After the first box body 1 and the second box body 4 are hoisted to the corresponding positions, the rope is untied so that the square ring of the lock buckle 6 falls on the hook of the connecting hook 3, and the same number of protruding steel bars are staggered and tied at the top of the first box body 1 and the second box body 4 to complete the connection of the first box body 1 and the second box body 4, and then concrete is poured in the connection area of ​​the first box body 1 and the second box body 4 to form a whole.

[0049] The following is a specific embodiment of a connection method of a connection device for a precast concrete box MIC of the present invention:

[0050] First, the embedded steel plates of the first embedded I-beam 2 and the second embedded I-beam 5 are manufactured and welded into the shape of the I-beam so that the welds 10 are symmetrical and 3 mm on each side;

[0051] Second, two nuts 8 are symmetrically welded on the side where the embedded steel plate contacts the I-beam installation mold 7; they can correspond to the holes reserved on the I-beam installation mold 7 to ensure the convenience of later construction; the I-beam installation mold 7 is a customized mold, and the position of the embedded parts is determined in advance; the size of the embedded steel plate is smaller than the steel bar spacing of the steel cage on the first box body 1 and the second box body 4. When tying the steel cage, pay attention to the position of the embedded steel plate. The embedded steel plates are staggered up and down, arranged in rows on the left and right, and evenly spaced. The tying position of the steel bars is planned in advance to avoid position conflicts between the embedded steel plates and the steel bars.

[0052] Third, remove the mold, clean the box wall where the first and second embedded I-beams 2 and 5 are embedded, and locate the embedded steel plates. Then, weld the connecting hook 3 to the first embedded I-beam 2 with an 8mm weld seam. Weld a semicircular steel piece 51 to the second embedded I-beam 5, and install a square ring lock buckle 6 on the semicircular steel piece 51 with a 6mm weld seam. Mark the positions in advance with a marker, with a horizontal spacing of 1000mm, to ensure the symmetry of the embedded parts on the back-cast surfaces of the two walls, and then weld.

[0053] Fourth, the factory in advance on the second embedded I-beam 5 on the lock 6 ring with rope lifting, such as Figure 10 , the box is left with a knot, fixed rope embedded parts and other measures to prevent the rope from falling off during transport; to reach the hoisting destination, the first box 1 and the second box 4 are hoisted to the corresponding position, the rope on the lock 6 is untied, and it is freely dropped on the hook of the connecting hook 3. By observing the position of the lock 6 and the connecting hook 3, the position deviation of the first box 1 and the second box 4 is determined and fine-tuned, and then the same number of external reinforcing steel bars are bound on the top of the first box 1 and the second box 4, thereby completing the connection on site.

[0054] The connecting device of the prefabricated concrete box MIC provided by the utility model, when the semicircular ring rigid part 51 is welded, the square ring lock 6 can be rotated up and down in the semicircular ring rigid part 51 and is sensitive; the size of the I-beam steel plate is smaller than the reinforcing steel bar spacing, the thickness of the steel plate is smaller than the wall reinforcing steel bar protective layer thickness, and the I-beam steel plate is prevented from colliding with the reinforcing steel bar during embedding; when the first embedded I-beam 2, the second embedded I-beam 5 or the I-beam mounting mold 7 is made, the position of the hole in the I-beam mounting mold 7 and the nut 8 welded on the first embedded I-beam 2 and the second embedded I-beam 5 can be corresponded; the position of the hole in the I-beam mounting mold 7 corresponds to the embedded part position in the drawing design, and the holes are arranged in rows and columns and are planned in advance. When the connecting hook 3 and the lock 6 are made, the positions can be corresponded, the error is paid attention to, and the connection difficulty is avoided.

[0055] Those skilled in the art can easily understand that the above description is only a preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A connection device for a precast concrete box MIC, characterized by: The invention comprises a first embedded I-beam (2) arranged on the side of the steel cage of the first box body (1) and staggered from top to bottom, a connecting hook (3) arranged on the first embedded I-beam (2), a second embedded I-beam (5) arranged on the side of the steel cage of the second box body (4) and staggered from top to bottom, and a lock (6) arranged on the second embedded I-beam (5) and capable of being locked with the connecting hook (3); wherein, The connecting hook (3) is provided with saw teeth (31), a first magnet (32) and a self-locking hook (33); the lock buckle (6) comprises a rotating rod (61) rotatably connected to the second embedded I-beam (5), side rods (62) vertically arranged at both ends of the rotating rod (61), and a locking rod (63) arranged between the two side rods (62); the locking rod (63) is provided with a tooth groove (631) adapted to the saw teeth (31) on the connecting hook (3) and a second magnet (64) adapted to the first magnet (32); A semicircular steel member (51) is provided on the second embedded I-beam (5); the rotating rod (61) is provided at the center of the semicircular steel member (51); The self-locking hook (33) is retractably arranged at the hook tip of the connecting hook (3). When the lock buckle (6) is buckled onto the connecting hook (3), the self-locking hook (33) is first pressed into the interior of the connecting hook (3). After the lock buckle (6) and the connecting hook (3) are buckled, the self-locking hook (33) immediately pops out, thereby automatically locking the lock buckle (6).

2. The connection device for a precast concrete box MIC according to claim 1, characterized in that: The positions of the first embedded I-beam (2) and the second embedded I-beam (5) correspond to each other; the heights of the first embedded I-beam (2) and the second embedded I-beam (5) are the same and are both smaller than the steel bar spacing of the corresponding steel bar cage on the box body.

3. The connection device for a precast concrete box MIC according to claim 2, characterized in that: The first embedded I-beam (2) and the second embedded I-beam (5) are installed on the first box body (1) or the second box body (4) via an I-beam installation mold (7).

4. The connection device for a precast concrete box MIC according to claim 3, characterized in that: Nuts (8) are welded to the upper and lower ends of the first embedded I-beam (2) and the second embedded I-beam (5), respectively.

5. The connection device for a precast concrete box MIC according to claim 4, characterized in that: The I-beam mounting mold (7) is provided with a plurality of reserved holes, two in a group; the nuts (8) are adapted to the reserved holes on the I-beam mounting mold (7).

6. The connection device for a precast concrete box MIC according to claim 5, characterized in that: The nut (8) is welded to any one of the two opposite embedded steel plates on the first embedded I-beam (2) and the second embedded I-beam (5).

7. A connection device for a precast concrete box MIC according to any one of claims 1 to 6, characterized in that: The self-locking hook (33) is provided with a locking tongue, which is retractably arranged at the hook tip of the connecting hook (3); The first magnet (32) is arranged on the inner bottom of the connecting hook (3); The saw teeth (31) are arranged between the lower edge of the lock tongue and the upper surface of the first magnet (32).

8. The connection device for a precast concrete box MIC according to claim 7, characterized in that: The second magnet (64) is provided on the lower surface of the lock buckle (6); After the lock buckle (6) and the connecting hook (3) are fastened, the top of the first magnet (32) and the second magnet (64) on the lower surface of the lock buckle (6) are attracted to each other.

9. A connection device for a precast concrete box MIC according to any one of claims 1 to 6 or 8, characterized in that: The same number of protruding steel bars are staggeredly arranged on the top of the first box body (1) and the second box body (4); the protruding steel bars are bent downward; The entire surface of the wall facing each other between the first box body (1) and the second box body (4) is provided with a rough water washing surface; The first box body (1) and the second box body (4) are connected by post-cast concrete.

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